Antimony oxide dissolves in HCI to form a compound (X).Compound (X) gives a orange precipitate (Y) with H_(2)S .Hence
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Hydrolysis of Antimony(III)-Hydrochloric Acid Solution at 25C*1
Hiroyuki Hashimoto, Tadahisa Nishimura and Yoshiaki Umetsu*2
Institute of Multidisciplinary Research for Advanced Materials (IMRAM), Tohoku University, Sendai 980-8577, Japan
The system Sb(III)-HCl–H2O has been studied by equilibrating mixtures of antimony trioxide and hydrochloric acid solution (<6 kmol/m3 ) at 25 C for 30 days. X-ray diffraction analysis of the solids showed the existence of Sb2 O3 (HCl < 0.1 kmol/m3 ) and Sb4 O5 Cl2 (HCl>0.1 kmol/m3 ) as the final solid phases. The solubility for both compounds was also determined as a function of HCl concentration. The hydrolysis of antimony(III)-hydrochloric acid solution (Sb(III) = 140 mg/L, HCl = 0.1 and 1.0 kmol/m3 ) by neutralizing with NaOH solution was then studied in a pH range of 1.1 to 12.3 at 25C. The amorphous Sb8O10(OH)2Cl2 (spherical, particle size: 0.05–0.2mm), crystalline Sb8O10(OH)2Cl2 (orthorhombic, rectangular plate in 1mm thick layer) and crystalline Sb2O3 (orthorhombic) were found to be a solid phase depending on pH and hydrolysis time. The particle morphology of Sb2O3 was affected strongly by pH. The minimum solubility of crystalline Sb8O10(OH)2Cl2 (pH 2–3) and Sb2O3 (pH 3–11) was at a level of 10mg/L in Sb(III).
(Received February 3, 2003; Accepted May 27, 2003)
Keywords: hydrolysis, antimony, hydrochloric acid solution, oxide, oxychloride
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